Crane, and method and device for controlling super-lifting derricking oil cylinder thereof

Abstract

The invention provides a crane, and a method and device for controlling a super-lifting derricking oil cylinder of the crane. The control method comprises the following steps of: acquiring a first included angle between a super-lifting mast and a lifting arm of the crane and a second included angle between the lifting arm and a horizontal plane in real time; calculating a real-time oil pressure for overcoming the self weight of the super-lifting mast when the lifting arm is in the second included angle and the super-lifting derricking oil cylinder is in the first included angle; and setting a safe working pressure of the super-lifting derricking cylinder in real time according to the real-time oil pressure. According to the method provided by the invention, the safe working pressure of the super-lifting derricking oil cylinder is set according to the real-time oil pressure corresponding to the first included angle and the second included angle, so that the pressure value of the super-lifting derricking oil cylinder does not need to be kept in a maximum working pressure state of the system, deformation of structural components such as super-lifting pedestals or accidents caused by pressure surge of the system due to unexpected circumstances can be prevented, a super-lifting structure does not need to be designed large, and the lifting capability of the whole crane is improved.

Description

technical field [0001] The invention relates to the field of cranes, in particular to a control method and device for a crane and its super-lift luffing oil cylinder. Background technique [0002] In order to increase the lifting capacity of the crane and improve the stress condition of the boom, a super-lifting device is often added at the end of the telescopic boom. For the hoisting conditions that require super-lifting auxiliary operations, the super-lifting device must first be installed, and the super-lifting mast is transformed to a position at an angle of 90° to the boom under the action of the super-lifting luffing cylinder. In the process of installing the super-lifting device, the boom should be put down first, and then the super-lifting device should be connected to the boom. When the mast is super-lifted, the position is maintained, and then the boom is luffed to the hoisting state. [0003] During the luffing stage of the super-lifting mast, the angle between ...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a control method and device for a crane and its superlift luffing cylinder, which can monitor the working pressure of the superlift luffing cylinder, so as to solve the n

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